An unconventional design known as the diverging diamond interchange can be both safer and more efficient than conventional left turn lanes. Road planners across the country are switching sides.
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Just take Exit 111 at Marvin Road, also known as the Hawks Prairie area.
The stateâs first âdiverging diamondâ interchange opened there with six lanes of traffic in August. More signal timing and landscaping will be done before the job is complete in early 2021.
A second version begins construction this summer in Snoqualmie, the centerpiece of a $147 million overhaul at the treacherous Interstate 90 to Highway 18 junction.
Drivers from either side approach the Lacey overpass using the right three lanes, then curve to the left side while above the freeway, then return to land while curving back to the right side.